Bolak: My father was born in Lwow in 1914 - How can I trace his genealogy line?

How can I trace his genealogy line or did the Russians destroy all records relating to Polish people? His surname was Bolak.

If your ancestor was a Roman Catholic, many parish records were saved and are in Warsaw in National Archives.
The most important is what was a parish of your great-grandparents. If you have any Church certificate (birth, marriage, death) - there must be a parish name on it.

If not try to google it or give the family name here and I try with google tricks.

Are you looking for information about people with those surnames or the etymology of the name? I have some Klimaszewski in my family as well as some documentation from the 1910's if that helps you.